— Paula Modersohn-Beckerquote from a letter to her husband Otto Modersohn from Paris, 29 February, 1900; as quoted in Expressionism, a German intuition, 1905-1920, Neugroschel, Joachim; Vogt, Paul; Keller, Horst; Urban, Martin; Dube, Wolf Dieter; (transl. Joachim Neugroschel); publisher: Solomon R. Guggenheim Foundation, New York, 1980, p. 31
as early as 1900 Paula Modersohn-Becker had written from Paris that she longed for stronger and deeper colors in her own work

— Paula Modersohn-BeckerIn a letter from Worpswede, 21 October, 1907, to her friend Clara Rilke-Westhoff; as quoted in Voicing our visions, - Writings by women artists; ed. Mara R. Witzling, Universe New York, 1991, p. 208
October 1907 Rilke started to write his famous series 'Letters on Cézanne' to his wife Clara Rilke-Westhoff